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• - Just press play, you mean?

• - [Voiceover] Yeah, go for it. Whoa!

• - Now, you may have seen a Ruben's tube before. That's basically a pipe with a bunch of holes

• in it, and you pump in a flammable gas, and light it on fire, so you basically create

• a row of Bunsen burners. What's really cool is to play some sounds into the tube, and

• you can actually set up standing waves. That is, there are areas, there are patterns of

• the vibration of the air where there's a lot of vibration in some parts, and not very much

• vibration in other parts. Now, that affects the flow rate of the gas inside that tube

• into the atmosphere, and so it affects the height of those flames. So basically, you

• can visualize the standing wave pattern. I'm currently in Denmark with a team of physics

• and chemistry demonstrators who have taken this experiment to the next level. They've

• actually created a two-dimensional Ruben's tube, a whole plane of Bunsen burners, effectively.

• How many holes in this tube?

• - 2,500

• - [Voiceover] 2,500 in this Pyro Board?

• - Yeah

• - [Voiceover] So we're gonna see 2,500 little flames. Yeah. So, do you want to light it

• up?

• - Yes, I really want to light it up.

• - [Voiceover] Why did you make this?

• - Because, we really liked the Ruben's tube, but then we thought, ah, when you put on more

• fire, then it always gets better. And, let’s just turn it down. And then we can just try

• to find a standing wave. So this is below the lowest standing wave. See that? It's really

• difficult to see

• - [Voiceover] So what are we seeing here?

• - It's pretty much like the standing wave on the Ruben's tube. It's just in this direction.

• This is the lowest frequency that makes a standing wave in this pulse.

• - [Voiceover] So this is like the fundamental.

• - It's the fundamental.

• - [Voiceover] Can you show me what happens when you vary the volume a little bit?

• - Yeah.

• - [Voiceover] Whoa! That was awesome. Okay, should we try to find another standing wave?

• - [Sune] Yes. You can see it. You can see it. You can hear it before you can see it.

• - [Voiceover] Whoa! It's weird. With the microphones, I can actually hear, like here, I'm in a node.

• Then here I'm in an anti-node. Here I'm in a node.

• - [Sune] Because you can measure the sound pressure?

• - [Voiceover] I can hear it. Like here is very much an anti-node.

• - [Sune] I never thought about that.

• - [Voiceover] This is a node, and you guys can hear it.

• - [Sune] That's true.

• - [Voiceover] It's incredible. The flames must be coming out in the anti-nodes.

• - The flames are coming up in the anti-nodes, yeah.

• - [Voiceover] And you can even hear it. That’s incredible.

• - Yeah It's nice that it can do that.

• - [Voiceover] That is awesome.

• - [Sune] We just learned something.

• - [Voiceover] What happens if we try to go higher frequency?

• - [Sune] Yeah. We have something. Oh, that's a good one.

• - [Voiceover] That is crazy. We're right in the anti-node.

• - [Sune] Is your ears okay?

• - [Voiceover] Oh, God!

• - My ears are hurting now.

• - [Voiceover] That was painful. Why don't we try to put something more pleasing to the

• ear through the speaker and see what happens.

• - I think that's a good idea.

• - [Voiceover] Let's put some music on there. You ready?

• - Go.

• - So, you go around Denmark showing kids all about physics?

• - We do. That's what we do.

• - You show them the Pyro Board?

• - We show them the Pyro Board, and we show them a whole lot of other stuff.

• - You guys are also on YouTube?

• - Yep, we have a YouTube channel. You can go to this link, right here.

• - Go check it out if you want to see more of what these guys are up to. It's awesome.

• - [Sune] It's great.

• - Ahoy. That is the actual Czech word for hello. I have made it to Olomouc in the Czech

• Republic, and this is partly thanks to support from Audible.com, the leading provider of

• audio books, with over 150,000 titles in all areas of literature, including fiction, non-fiction,

• and periodicals. Now, today I wanted to recommend a book, which is a little bit European, and

• it's called Galileo's Daughter by Dava Sobel. I love this book because it includes the actual

• letters written from Galileo's daughter to him during his life, and it really reveals

• what he must have gone through as a human being. We all know about his science, and

• about the trials that he went through, but to see this kind of insight into his personal

• life, I think is remarkable, so you should really check out this book, and you can download

• it for free by going to audible.com/veritasium, or you can pick any other book of your choosing

• for a one month free trial. So I really want to thank Audible for supporting me, and allowing

• me to go and meet great scientists, and filmmakers, and lots of people all around the world. Also,

• I should note that I will be hosting Michio Kaku in Brisbane and Melbourne on June 5th

• and 6th. Links in the doobly-doo. I would love to see you there. Thank you so much for

• watching, and I will see you somewhere else in the world. Bye.

- Just press play, you mean?

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A2 US tube node wave standing anti vibration

Pyro Board: 2D Rubens' Tube!

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amd posted on 2016/09/30
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